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Note 1 - Organization (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2023
Dec. 31, 2022
Cash and Cash Equivalents, at Carrying Value   $ 200,023 $ 157,306
True Human [Member]      
Sale of Product, Consideration Received $ 750,000    
Potential Milestone Payments $ 600,000